Hawzah News Agency – The merciful prophet of Islam, peace be upon him and his household says:

لا يُخرِجُ المؤمنَ من إيمانِهِ ذَنبٌ، كَما لا يُخرِجُ الكافِرَ مِن كُفرِهِ إحسانٌ .

'A sin cannot expel the faithful person from his faith, just as an act of goodness cannot expel an infidel from his faithlessness.'

Source: Kanz al-Ummal, no. 1333